Related Clues:

• 1776 or 1945
• See 61-Across
• Geological time
• Geologist's time division
• Oft-nicknamed period
• Geological period
• Important time
• Round of seasons
• End of an ___
• Piece of the past
• Memorable age
• Napoleonic, for one
• Prominent span of years
• Low no. for Roger Clemens
• Period of years